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Centering bit 48-20-5495 (included) is recommended for exact spot drilling and to avoid bit wandering during use. the drift key 48-20-5497 (not included) allows for easy removal of the centering bit. the one piece core bits are available in sds-max or spline shanks, ranging from 1-1/2” to 6” diameters and overall lengths of 11-3/8” or 22”, with a drilling depth of 3”.

New stainless steel cross bit bollard a top quality deck fitting stainless steel cross bit mooring bollard. diameter: 2-1/4" height: 5" width: 6" base: 4 x 5". availability: usually ships in 2-3 business days. mpd_2961 regular price: $69.98 sale price: $34.98.

Aug 14, 2020 · since its beginning in 1985, numa has become a major manufacturer of dth hammers and bits for the domestic and international drilling industry. the company designs and builds downhole hammers and bits for drilling vertical and horizontal holes 3½ to 50½ inches (89 to 1,283 millimeters) in diameter. to learn more, visit www.numahammers.

The optimum range of hole size for dth drilling is 90 mm (3.5”) to 254 mm (10”). smaller holes are generally drilled using tophammer drill rigs, and larger holes generally use rotary drill rigs. as a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”).

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